Touch display screen, control method of touch display screen, touch display equipment and control method of touch display equipment

Abstract

The invention discloses a touch display screen, a control method of the touch display screen, touch display equipment and a control method of the touch display equipment, relates to the technical field of display, and aims to reduce the influence of application of an active pen on the display screen so as to improve the performance of display, touch detection and active pen detection of the display screen. The control method of the display screen comprises the steps that in the first long-line blanking stage, the touch display screen emits an uplink signal, and the uplink signal is used for detecting whether an active pen operates the touch display screen or not. In the second to mth long row blanking stages, the touch display screen receives a downlink signal from the active pen to perform active pen detection. The control method can be used for controlling the touch display screen to realize detection of the active pen.

Description

Touch display screen and control method thereof, touch display device and control method thereof

[0001] This application claims priority to the PCT international application filed with the State Intellectual Property Office on November 14, 2022, with application number PCT / CN2022 / 131785 and application name “Touch display screen and driving circuit, active pen detection scheme for touch display screen”, the entire contents of which are incorporated by reference in this application. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a touch display screen and a control method thereof, a touch display device and a control method thereof. Background Art

[0003] With the development of liquid crystal display technology, touch and display functions can now be integrated to form touch screens. In-cell touch screens, also known as in-cell touch screens, feature touch electrodes embedded within the display. Their thinness, high light transmittance, and low cost have made them a mainstream display technology.

[0004] The touch electrodes in the display screen work in a time sequence. In the display stage, the touch electrodes are reused as common electrodes and receive common voltage signals to drive the display. In the touch stage, the touch electrodes receive drive signals to perform touch detection, which may include touch detection and active pen detection.

[0005] The active pen and display are two independent systems. To ensure that they can work together, the active pen needs to interact with the display in a two-way manner according to the protocol. However, the protocol stipulates the timing relationship between the active pen and the display, which will limit the control of the display's timing (display phase and touch phase), thereby affecting the display's display, touch detection and active pen detection performance.

[0006] Summary of the Invention

[0007] The embodiments of the present application provide a touch display screen and a control method thereof, a touch display device and a control method thereof, which are intended to reduce the impact of an active pen on the display screen, thereby improving the display, touch detection, and active pen detection performance of the display screen.

[0008] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0009] In a first aspect, a control method for a touch display screen is provided, wherein the display of the touch display screen includes multiple frame periods, each frame period includes a frame blanking interval and an effective working interval, the effective working interval includes multiple display refresh stages and multiple long line blanking stages that are alternately arranged, and the multiple long line blanking stages include the 1st to mth long line blanking stages, where m≥2.

[0010] The control method includes: transmitting an uplink signal during the first long line blanking phase, the uplink signal being used to detect whether an active pen is operating the touch screen, and receiving a downlink signal from the active pen during the second to mth long line blanking phases to perform active pen detection.

[0011] In the control method provided by the above embodiment of the present application, the touch screen transmits an uplink signal during the first long line blanking phase, and receives a downlink signal from the active pen during the subsequent long line blanking phase to perform active pen detection.

[0012] The position of the long line blanking stage changes in different frame periods. In this case, by controlling the touch display screen to transmit the uplink signal in the first long line blanking stage and not transmitting the uplink signal in the frame blanking interval, when the position of the long line blanking stage changes, there is no need to increase the time width of the frame blanking interval to ensure that the transmission of the uplink signal is within the frame blanking interval, which can avoid compressing the time width of the effective working interval and avoid compressing the time width of the display refresh stage and the touch detection stage, which is beneficial to improving the display refresh, touch detection and active pen detection performance of the touch display screen.

[0013] In some embodiments, the multiple display refresh phases include row scan periods of multiple rows of sub-pixels on the touch display screen, and in at least two frame cycles, the corresponding two long row blanking phases are respectively located between row scan periods of two different adjacent rows of sub-pixels.

[0014] It can be understood that in at least two frame periods, the corresponding two long-line blanking phases are respectively located between the line scanning periods of two different adjacent rows of sub-pixels. That is, by changing the position of the long-line blanking phase in different frame periods, the gate scanning signal in the touch display screen stays in different shift registers for roughly the same time. In this way, the speed at which different shift registers age and the driving force decreases is roughly the same, which can improve the phenomenon of "bright lines" or "dark lines" displayed by sub-pixels in each row, thereby improving the quality of the displayed image.

[0015] In some embodiments, in two adjacent frame periods, two corresponding long row blanking phases are respectively located between row scanning periods of two different adjacent rows of sub-pixels.

[0016] It can be understood that by changing the position of the long-line blanking phase within two adjacent frame periods, the time that the gate scanning signal stays in the same shift register can be further shortened, which is beneficial to reducing the speed at which the shift register ages and the driving force decreases, improving the phenomenon of the sub-pixels in this row displaying "bright lines" or "dark lines", and improving the quality of the displayed image.

[0017] In some embodiments, in different frame periods, the durations of intervals between the multiple long line blanking phases remain unchanged.

[0018] The protocol between the active pen and the touchscreen specifies fixed intervals between uplink and downlink signals, as well as between adjacent downlink signals. By synchronously shifting the positions of multiple long-line blanking phases across different frame periods, the intervals between these phases remain constant, ensuring accurate active pen detection.

[0019] In some embodiments, in a frame period, the multiple long-line blanking phases include at least three long-line blanking phases, and the duration between any two adjacent long-line blanking phases is equal, so that the multiple long-line blanking phases are evenly distributed between the row scanning periods of multiple rows of sub-pixels.

[0020] On this basis, by changing the position of the long-line blanking phase in different frame cycles, the gate scanning signal stays in the shift registers at each level for roughly the same time. In this way, the shift registers at each level age and the driving force decreases at roughly the same rate, which can improve the phenomenon of "bright lines" or "dark lines" displayed by sub-pixels in each row and improve the quality of the displayed image.

[0021] In some embodiments, the durations of the second to m-th long line blanking periods are equal, and the duration of the first long line blanking period is not equal to the duration of any of the second to m-th long line blanking periods. Alternatively, the durations of the first to m-th long line blanking periods are equal.

[0022] In the above embodiment, according to the protocol between the active pen and the touch display, the duration of the uplink signal is a, and the duration of the downlink signal is c. The touch display transmits the uplink signal during the first long line blanking phase and performs active pen detection based on the downlink signal during the second through mth long line blanking phases. Therefore, the duration of the first long line blanking phase is a, and the durations of the second through mth long line blanking phases are all equal, namely c.

[0023] When a≠c, the duration of the first long line blanking phase is not equal to the duration of any of the second to m-th long line blanking phases. When a=c, the durations of the first to m-th long line blanking phases are all equal.

[0024] In some embodiments, the duration of the uplink signal is equal to the duration of the first long line blanking period.

[0025] In some embodiments, the method for controlling a touch display screen further includes: performing touch detection during the second to mth long line blanking phases based on the touch display screen not receiving a downlink signal.

[0026] It can be understood that in the 2nd to mth long line blanking stages, when the touch screen does not receive the downlink signal, it indicates that the active pen is not close to the touch screen and the active pen does not operate the touch screen. Based on this, touch detection can be performed.

[0027] In some embodiments, the method for controlling a touch display screen further includes: performing touch detection during a frame blanking interval.

[0028] It is understandable that during the frame blanking interval, the touch display screen does not perform display refresh, and the touch electrodes can be used to perform touch detection to detect the user's touch operation on the touch display screen.

[0029] In some embodiments, the method for controlling a touch display screen further includes: performing display driving during a display refresh phase.

[0030] It can be understood that in the display refresh stage, multiple touch electrodes are reused as common electrodes, and the touch electrodes and the pixel electrodes of the touch display form an electric field to drive the liquid crystal molecules in the liquid crystal layer in the touch display to rotate, thereby realizing display driving of the touch display.

[0031] In a second aspect, a touch screen display is provided, wherein the display of the touch screen includes multiple frame periods, each frame period including a frame blanking interval and an effective working interval, the effective working interval including multiple display refresh phases and multiple long line blanking phases arranged alternately, the multiple long line blanking phases including the first to mth long line blanking phases, where m ≥ 2. The touch screen display is configured to transmit an uplink signal during the first long line blanking phase and to receive a downlink signal from an active pen during the second to mth long line blanking phases.

[0032] In the touch screen provided by the above embodiment of the present application, the touch screen transmits an uplink signal during the first long line blanking phase, and receives a downlink signal from the active pen during the subsequent long line blanking phase to perform active pen detection.

[0033] The position of the long line blanking stage changes in different frame periods. In this case, by controlling the touch display screen to transmit the uplink signal in the first long line blanking stage and not transmitting the uplink signal in the frame blanking interval, when the position of the long line blanking stage changes, there is no need to increase the time width of the frame blanking interval to ensure that the transmission of the uplink signal is within the frame blanking interval, which can avoid compressing the time width of the effective working interval and avoid compressing the time width of the display refresh stage and the touch detection stage, which is beneficial to improving the display refresh, touch detection and active pen detection performance of the touch display screen.

[0034] In some embodiments, a touch screen includes a timing controller, a touch driving circuit, and a plurality of touch electrodes disposed inside the touch screen. The timing controller is electrically connected to the plurality of touch electrodes via the touch driving circuit.

[0035] The timing controller is configured to send a first control signal to the touch driving circuit during the first long line blanking phase. The touch driving circuit is configured to drive the plurality of touch electrodes to transmit an uplink signal in response to the first control signal.

[0036] The timing controller is further configured to send a second control signal to the touch driving circuit during the second to mth long line blanking periods. The touch driving circuit is further configured to perform active pen detection in response to the second control signal based on the plurality of touch electrodes receiving a downlink signal from the active pen.

[0037] In the above embodiment, the touch driving circuit is controlled by the timing controller. In the first long line blanking phase, the touch driving circuit transmits a driving signal to the touch electrodes to drive the multiple touch electrodes to transmit the uplink signal.

[0038] Furthermore, during the second to mth long line blanking phases, if an active stylus approaches a touch electrode, the touch electrode senses the active stylus and receives a downward signal from the active stylus. The touch driver circuit, controlled by the timing controller, detects the active stylus based on the downward signal from the touch electrode.

[0039] In some embodiments, the timing controller is further configured to send a third control signal to the touch driving circuit during the second to mth long line blanking periods. The touch driving circuit is further configured to drive the multiple touch electrodes to perform touch detection in response to the third control signal based on the multiple touch electrodes not receiving a downlink signal from the active pen.

[0040] In the above embodiment, in the second to mth long line blanking phases, when the plurality of touch electrodes do not receive the downlink signal, it indicates that the active pen is not close to the touch display screen and the active pen is not operating the touch display screen.

[0041] Based on this, when a user touches the touch display screen, the touch electrodes generate sensing signals, which are controlled by the timing controller to control the touch driving circuit, which can then perform touch detection based on the sensing signals.

[0042] In some embodiments, the timing controller is further configured to send a fourth control signal to the touch driving circuit during a frame blanking interval. The touch driving circuit is further configured to drive the plurality of touch electrodes to perform touch detection in response to the fourth control signal.

[0043] In the above embodiment, the touch screen does not refresh its display during the frame blanking interval. Therefore, when a user touches the touch screen, the touch electrodes generate sensing signals. The timing controller controls the touch driver circuit, which then performs touch detection based on the sensing signals.

[0044] In some embodiments, the timing controller is further configured to send a fifth control signal to the touch driving circuit during a display refresh phase. The touch driving circuit is further configured to drive the plurality of touch electrodes to perform display driving in response to the fifth control signal.

[0045] In the above embodiment, during the display refresh phase, multiple touch electrodes are reused as a common electrode. A timing controller controls the touch driver circuit to transmit a common voltage signal to the multiple touch electrodes. Furthermore, the pixel electrodes receive pixel voltage signals from the pixel driver circuit. The pixel electrodes and touch electrodes form an electric field, driving the rotation of liquid crystal molecules in the liquid crystal layer, thereby achieving display drive for the touchscreen display.

[0046] In a third aspect, a touch display device is provided, comprising an active stylus and the touch display screen of any of the above embodiments. The touch display screen is configured to transmit an uplink signal during a first long line blanking period. The active stylus is configured to transmit at least one downlink signal in response to the uplink signal. The touch display screen is further configured to receive at least one downlink signal during at least one of the second to mth long line blanking periods to detect the active stylus.

[0047] In the touch display device provided in the above-described embodiments of the present application, the touch display screen can transmit an uplink signal during the first long line blanking phase. According to the protocol between the active pen and the touch display screen, the active pen can transmit at least one downlink signal in response to the uplink signal during at least one of the second to mth long line blanking phases. The touch display screen can receive the downlink signal during the corresponding long line blanking phase to detect the active pen.

[0048] The position of the long line blanking phase changes in different frame periods. In this case, the touch display transmits an uplink signal in the first long line blanking phase, and does not transmit an uplink signal in the frame blanking interval. The change in the position of the uplink signal does not require an increase in the time width of the frame blanking interval, thereby avoiding compressing the time width of the effective working interval and the time width of the display refresh phase and the touch detection phase, which is beneficial to improving the display refresh, touch detection and active pen detection performance of the touch display.

[0049] In a fourth aspect, a control method for a touch display device is provided, the touch display device comprising an active stylus and the touch display screen of any of the aforementioned embodiments. The control method comprises: during a first long line blanking phase, the touch display screen transmits an uplink signal, and the active stylus receives the uplink signal. During at least one long line blanking phase from the second to the mth long line blanking phases, the active stylus transmits a downlink signal in response to the uplink signal; and the touch display screen receives the downlink signal to detect the active stylus.

[0050] In the control method provided by the above-described embodiments of the present application, during the first long line blanking phase, the touch display transmits an uplink signal, and the active stylus receives the uplink signal. According to the protocol between the active stylus and the touch display, during at least one subsequent long line blanking phase, the active stylus transmits a downlink signal in response to the uplink signal, and the touch display receives the downlink signal, thereby detecting the active stylus.

[0051] The position of the long line blanking phase changes in different frame periods. In this case, the touch display transmits an uplink signal in the first long line blanking phase, and does not transmit an uplink signal in the frame blanking interval. The change in the position of the uplink signal does not require an increase in the time width of the frame blanking interval, thereby avoiding compressing the time width of the effective working interval and the time width of the display refresh phase and the touch detection phase, which is beneficial to improving the display refresh, touch detection and active pen detection performance of the touch display. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] To more clearly illustrate the technical solutions of the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure, and those skilled in the art can also derive other drawings based on these drawings. Furthermore, the drawings described below are schematic diagrams and are not intended to limit the actual dimensions of the products, actual processes of the methods, actual timing of signals, and the like involved in the embodiments of the present disclosure.

[0053] FIG1 is a structural diagram of a touch display device according to some embodiments;

[0054] FIG2 is a cross-sectional view of the touch display screen in FIG1 along section line AA′;

[0055] FIG3 is a cross-sectional view of the touch display screen along section line BB′ in FIG2 ;

[0056] FIG4 is a control timing diagram of a touch display screen according to some embodiments;

[0057] FIG5 is a waveform diagram of row scanning signals of sub-pixels in each row of a touch display screen according to some embodiments;

[0058] FIG6 is a timing diagram illustrating the relationship between the touch detection phase and the row scanning period according to some embodiments;

[0059] FIG7 is a schematic diagram of a method for controlling a touch display screen according to some embodiments;

[0060] FIG8 is a timing diagram of an uplink signal and a downlink signal in the related art;

[0061] FIG9 is a schematic diagram of a control method of a touch display screen in the related art;

[0062] FIG10 is a schematic diagram of a method for controlling a touch display screen according to some embodiments;

[0063] FIG11 is a flow chart of a method for controlling a touch display screen according to some embodiments;

[0064] 12 to 14 are various flow charts of methods for controlling a touch display screen according to some embodiments;

[0065] FIG15 is a structural diagram of a touch display screen according to some embodiments;

[0066] FIG16 is a flowchart of a method for controlling a touch display device according to some embodiments. DETAILED DESCRIPTION

[0067] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0068] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to has a specific orientation, is constructed and operates in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0069] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as having an open, inclusive meaning, that is, "including, but not limited to." In the description of the specification, the terms "one embodiment," "some embodiments," "exemplary embodiments," "exemplarily," or "some examples" are intended to indicate that specific features, structures, materials, or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0070] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0071] When describing some embodiments, the term "connected" and its derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the embodiments disclosed herein.

[0072] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0073] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0074] The use of "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0075] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0076] As used herein, "about" and "approximately" include the stated value and the average value that is within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0077] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary drawings. In the drawings, the thicknesses of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device and are not intended to limit the scope of the exemplary embodiments.

[0078] Some embodiments of the present application provide a touch display device. FIG1 is a structural diagram of a touch display device according to some embodiments; FIG2 is a cross-sectional view of the touch display screen in FIG1 along section line AA′; and FIG3 is a cross-sectional view of the touch display screen in FIG2 along section line BB′.

[0079] 1 , a touch display device 1 includes a touch display screen 2 and an active pen 3 .

[0080] The touch display device 1 can be a mobile terminal device such as a mobile phone or a tablet computer.

[0081] For example, referring to FIG2 , the touch screen 2 may be a liquid crystal display (LCD), which includes a liquid crystal display panel 20, a backlight module 21, and a cover glass 22. The backlight module 21 is used to provide light for the liquid crystal display panel 20. The liquid crystal display panel 20 includes an array substrate 23, an alignment substrate 24, a liquid crystal layer 25 disposed between the array substrate 23 and the alignment substrate 24, and touch electrodes 26 disposed between the alignment substrate 24 and the liquid crystal layer 25.

[0082] The array substrate 23 includes a plurality of sub-pixels arranged in an array, each of which includes multiple rows and columns. Each row of sub-pixels is electrically connected to a gate drive circuit via a gate line. The gate drive circuit transmits a gate scan signal to each row of sub-pixels via the gate line. Each row of sub-pixels can be turned on under the control of the gate scan signal to perform row scanning. Each column of sub-pixels is electrically connected to a data line, which can transmit a display data signal to the corresponding column of sub-pixels.

[0083] Referring to Figure 2 , each sub-pixel includes a pixel driving circuit 231 disposed on the first substrate 230 of the array substrate 23, and a pixel electrode 232 electrically connected to the pixel driving circuit 231. The pixel driving circuit 231 includes a thin-film transistor T (TFT), which comprises an active layer A, a source electrode S, a drain electrode D, and a gate electrode G. The source electrode S and the drain electrode D are respectively in contact with the active layer A. The pixel electrode 232 is electrically connected to the drain electrode D of the thin-film transistor T. The pixel electrode 232 has a comb-tooth structure comprising multiple strip-shaped sub-electrodes.

[0084] 2 , the alignment substrate 24 includes a color filter layer 241 disposed on a second substrate 240. In this case, the alignment substrate 24 may also be referred to as a color filter substrate (CF). The color filter layer 241 includes at least red, green, and blue photoresist units, each of which is aligned with the sub-pixels on the array substrate 23. The alignment substrate 24 also includes a black matrix pattern 242 disposed on the second substrate 240. The black matrix pattern 242 is used to separate the red, green, and blue photoresist units.

[0085] 2 , the touch screen 2 may further include a first optical film 27 disposed between the liquid crystal display panel 20 and the cover glass 22 , and a second optical film 28 disposed between the liquid crystal display panel 20 and the backlight module 21 .

[0086] The touch electrodes 26 are embedded in the touch screen 2. Therefore, the touch screen 2 can be called an in-cell touch screen. In-cell touch screens have become one of the mainstream LCD screens due to their thinness, high light transmittance, and low cost.

[0087] Referring to Figure 2, the touch electrode 26 works in a time sequence. During the display refresh stage, the touch electrode 26 is reused as a common electrode, and each row of sub-pixels is scanned. The pixel electrode 232 receives a pixel voltage signal from the pixel driving circuit 231, and the touch electrode 26 receives a common voltage signal. The pixel electrode 232 and the touch electrode 26 form an electric field to drive the liquid crystal molecules in the liquid crystal layer 25 to rotate, thereby adjusting the light output rate of the touch display screen 2.

[0088] Referring to Figure 3, the touch electrode 26 can be set on the box substrate 24. The touch display screen 2 also includes a touch line L and a touch driving circuit 29. The touch line L and the touch driving circuit 29 can both be set on the second substrate 240 of the box substrate 24. The touch electrode 26 can be electrically connected to the touch driving circuit 29 through the touch line L.

[0089] During the touch detection stage, the touch electrode 26 receives a drive signal from the touch drive circuit 29. When the user touches the touch display screen 2 or uses the active pen 3, the touch electrode 26 generates a sensing signal, and the touch drive circuit 29 can perform touch detection (touch detection or active pen detection) based on the sensing signal.

[0090] FIG4 is a control timing diagram of a touch display screen according to some embodiments.

[0091] 4 , the control signal of the touch screen 2 includes a frame synchronization signal (Vsync), which includes multiple frame periods T. The touch screen 2 displays a picture during each frame period T. Each frame period T includes a frame blanking interval (Vblank) T1 and an active working interval T2. Each active working interval T2 includes multiple display refresh phases T21 and multiple touch detection phases T22, which are alternately arranged.

[0092] It is understandable that in the frame blanking interval T1 , the touch screen display 2 does not perform display refresh, each row of sub-pixels turns off row scanning under the control of the gate line, and the data line connected to each column of sub-pixels does not update the display data signal.

[0093] Therefore, during the frame blanking interval T1, the touch electrodes 26 are not used for display refresh, and touch detection can be performed using the touch electrodes 26. That is, the touch display screen 2 can perform touch detection during the frame blanking interval T1.

[0094] Since the “effective working interval T2” includes the display refresh phase T21 and the touch detection phase T22 , the “effective working interval T2” refers to the time period during which the touch screen display 2 performs display refresh and touch detection.

[0095] Exemplarily, referring to FIG. 4 , the frame synchronization signal (Vsync) is at a low level in the frame blanking interval T1 and at a high level in the effective working interval T2 .

[0096] Typically, based on user experience, the touch detection frequency (also known as the touch reporting rate) of the touch screen 2 is set to be greater than the display refresh rate. In an embedded touch screen, the touch electrodes 26 operate in a timed manner, that is, touch detection and display refresh are performed in a timed manner. To ensure that the timing of the two is coordinated, the touch detection frequency can be set to an integer multiple of the display refresh rate.

[0097] For example, the touch detection frequency may be twice the display refresh frequency, that is, within each frame period T, the number of touch detection frames and display refresh frames is the same. For example, if the display refresh frequency is 60 Hz, 90 Hz, or 120 Hz, the corresponding touch detection frequency is 60 Hz, 90 Hz, or 120 Hz.

[0098] For example, the touch detection frequency may be twice the display refresh frequency, that is, the number of touch detection frames is twice the number of display refresh frames in each frame period T. For example, if the display refresh frequency is 60 Hz, 90 Hz, or 120 Hz, the corresponding touch detection frequency is 120 Hz, 180 Hz, or 240 Hz.

[0099] Continuing with FIG. 4 , when the display refresh frequency is 60 Hz and the touch detection frequency is 120 Hz, each frame period T includes one display refresh frame and two touch detection frames. Furthermore, one touch detection frame needs to be completed in four touch detection phases T22. Therefore, eight touch detection phases T22 need to be inserted into one display refresh frame. For example, the eight touch detection phases T22 are equally spaced and evenly distributed within the effective working interval T2.

[0100] FIG. 5 is a waveform diagram of row scanning signals for sub-pixels in each row of a touch display screen according to some embodiments.

[0101] 5 , the plurality of display refresh phases T21 include row scanning periods ( t1 , t2 . . . t(n)) of a plurality of rows of sub-pixels, where n≥2.

[0102] It can be understood that the multiple rows of sub-pixels include sub-pixels in the 1st to nth rows, and the sub-pixels in the 1st to nth rows correspond one-to-one and are connected to n gate lines (G1, G2...G(n)), and the n gate lines (G1, G2...G(n)) transmit row scanning signals respectively, and the row scanning time periods (t1, t2...t(n)) are performed in sequence, so that the sub-pixels in the 1st to nth rows are scanned row by row.

[0103] The following embodiments take the touch display screen 2 having a resolution of 1200×1920 as an example. The multiple sub-pixels arranged in an array include 1200 columns×1920 rows. In each frame period T, 1920 rows of sub-pixels are scanned row by row to transmit 1200 display data signals to the 1200 columns of sub-pixels.

[0104] The time interval between the row scanning periods of two adjacent rows of sub-pixels is called the "row blanking phase" (Hblank). Usually, the row blanking phase is short, with a time unit of the order of microseconds.

[0105] FIG. 6 is a timing diagram illustrating the relationship between a touch detection phase and a row scanning period according to some embodiments.

[0106] 6 , the touch detection phase T22 is inserted between the row scanning periods of two adjacent rows of sub-pixels, that is, the touch detection phase T22 belongs to the row blanking phase. Moreover, since the time setting of the touch detection phase T22 is relatively long, the touch detection phase T22 is also called the “long row blanking phase LH (Long Hblank)”.

[0107] For example, when eight touch detection phases T22 are inserted into one frame display refresh, the eight touch detection phases T22 are sequentially named LH1 to LH8, and LH1 to LH8 are evenly distributed between the row scanning periods (t1 to t1920) of the 1st to 1920th row sub-pixels.

[0108] For example, LH1 to LH8 may be located between t1 and t2, between t241 and t242, between t481 and t482, between t721 and t722, between t961 and t962, between t1201 and t1202, between t1441 and t1442, and between t1681 and t1682, respectively.

[0109] For another example, LH1 to LH8 may be located between t240 and t241, between t480 and t481, between t720 and t721, between t960 and t961, between t1200 and t1201, between t1440 and t1441, between t1680 and t1681, and between t1920 and t1921, respectively.

[0110] 6 shows a case where LH2 is located between t241 and t242, or between t480 and t481. For another example, LH2 may be located between t(a) and t(a+1), where 241<a<480.

[0111] The gate drive circuit includes a multi-stage shift register, which corresponds to and is connected to multiple gate lines one by one. Each stage of the shift register outputs a gate scanning signal to the corresponding gate line and transmits the gate scanning signal to the next stage of the shift register as an input signal.

[0112] The inventors of this application have discovered through research that the insertion of the long line blanking phase LH will delay the transmission of the gate scanning signal from the shift register to the next level, causing the gate scanning signal to stay in a certain shift register for a longer time, resulting in the aging of the shift register and the acceleration of the decline in driving force, which in turn causes the corresponding row of sub-pixels to display "bright lines" or "dark lines", reducing the quality of the displayed image.

[0113] Furthermore, when the touch screen 2 is a low-temperature polysilicon (LTPS) display, the shift register driving force drop phenomenon is less severe. When the touch screen 2 is an amorphous silicon (α-Si) display, the shift register driving force drop phenomenon is more severe.

[0114] To solve the above problems, some embodiments of the present application provide a method for controlling a touch display screen. FIG7 is a schematic diagram of a method for controlling a touch display screen according to some embodiments.

[0115] 7 , by changing the position of each long line blanking stage LH in different frame periods T, illustratively, in the i-th frame period and the j-th frame period (i≠j), the positions of LH1 to LH8 are all changed.

[0116] For example, during the i-th frame period and the j-th frame period, LH1 moves between t1 and t241, LH2 moves between t241 and t481, LH3 moves between t481 and t721, LH4 moves between t721 and t961, LH5 moves between t961 and t1201, LH6 moves between t1201 and t1441, LH7 moves between t1441 and t1681, and LH8 moves between t1681 and t1921, so that the corresponding two long row blanking stages LH are respectively located between the row scanning periods of two different adjacent rows of sub-pixels.

[0117] "Two corresponding long line blanking periods LH" refer to two long line blanking periods LH with the same sequence in two different frame periods. For example, LH1 in the i-th frame period corresponds to LH1 in the j-th frame period, LH2 in the i-th frame period corresponds to LH2 in the j-th frame period, and so on. LH8 in the i-th frame period corresponds to LH8 in the j-th frame period.

[0118] By adopting the above control method, the position of each long line blanking stage LH in different frame periods T is changed, so that the time that the gate scanning signal stays in different shift registers is roughly the same. In this way, the speed at which different shift registers age and their driving force decreases is roughly the same, which can improve the phenomenon of "bright lines" or "dark lines" displayed by sub-pixels in each row and improve the quality of the displayed image.

[0119] Currently, the use of active pens 3 in touch display devices 1 is becoming increasingly popular. Active pens 3 offer high performance and low cost. Specifically, active pens 3 can actively transmit signals for the touch display 2 to detect the pen tip, achieving high detection accuracy. Active pens 3 also support functions such as hover recognition, tilt angle detection, and pressure detection to better restore handwriting. Furthermore, active pens 3 are equipped with multiple control buttons corresponding to functions such as eraser and highlighter.

[0120] The active pen 3 and the touch screen 2 are two independent systems. To ensure that they can work together, the active pen 3 needs to interact with the touch screen 2 in a two-way manner according to the protocol. The touch screen 2 can transmit uplink signals, and the active pen 3 can receive uplink signals; the active pen 3 can transmit downlink signals, and the touch screen 2 can receive downlink signals, to achieve more flexible control between the two.

[0121] FIG8 is a timing relationship diagram of an uplink signal and a downlink signal in the related art.

[0122] As shown in Figure 8 , the protocol between active pen 3 and touch screen 2 stipulates that the frequency of uplink signals transmitted by touch screen 2 is the same as the display refresh rate. The uplink signal is transmitted during the frame blanking interval T1, and the duration of the uplink signal is a. After receiving the uplink signal, active pen 3 transmits a downlink signal once during each long line blanking interval (LH), for a total of n downlink signal transmissions. Furthermore, the interval between an uplink signal and the first downlink signal, as well as between two adjacent downlink signals, is b, and the duration of the downlink signal is c.

[0123] It is understandable that the touch display screen 2 does not perform display refresh in the frame blanking interval T1 , and the touch electrodes 26 are not used for display refresh. The touch electrodes 26 can be used to transmit uplink signals.

[0124] During the long line blanking period LH, the touch electrodes 26 can be used for touch detection or active pen detection. Therefore, the active pen 3 can transmit a downlink signal during the long line blanking period LH, so that the touch electrodes 26 can receive the downlink signal.

[0125] Typically, the uplink signal duration a has a fixed design value, while the interval duration b, downlink signal duration c, and number of times n have design ranges. These can be set based on the timing relationship between the frame blanking interval T1 and the long line blanking phase LH. However, once these parameters are set, they should not be frequently changed. Changes should only be made during significant scene changes (e.g., a change in the display refresh rate) to prevent the parameter changes from affecting the detection of the active pen 3.

[0126] Continuing with FIG8 , the time interval between the moment when the touch screen 2 starts transmitting the uplink signal and the moment when the frame blanking interval T1 begins is X. X also has a fixed design value, so that the position of the uplink signal is fixed relative to the position of the frame blanking interval T1. According to the protocol between the active pen 3 and the touch screen 2, the position of the downlink signal is also fixed.

[0127] However, the active pen 3 transmits a downlink signal during the long line blanking phase LH. The fixed position of the downlink signal means that the position of LH during the long line blanking phase also needs to be fixed, which may easily cause the shift register to age and the driving force to decrease faster, thereby causing the corresponding row of sub-pixels to display "bright lines" or "dark lines", reducing the quality of the display image.

[0128] Based on this, a control method for a touch display screen is provided in the related art. FIG9 is a schematic diagram of the control method for a touch display screen in the related art.

[0129] Referring to FIG9 , the position of the downlink signal is adjusted by changing the position of each long line blanking phase LH within different frame periods T. For example, the positions of the downlink1 signal and the downlink2 signal are different, so that the gate scan signal stays in different shift registers for roughly the same time, and the speed at which different shift registers age and their driving force decreases is roughly the same.

[0130] According to the protocol between the active pen 3 and the touch screen 2, when the position of the downlink signal is adjusted, the position of the uplink signal also needs to be adjusted synchronously. For example, the positions of the uplink1 signal and the uplink2 signal are different to ensure that the interval time b between the uplink signal and the first downlink signal remains unchanged.

[0131] Continuing to refer to FIG9 , by increasing the time width of the frame blanking interval T1, it is ensured that the position of the uplink signal remains within the frame blanking interval T1 after adjustment, thereby avoiding the time when the touch screen 2 transmits the uplink signal overlapping with the display refresh phase, thereby avoiding affecting the display refresh of the touch screen 2.

[0132] Exemplarily, the increased time width of the frame blanking interval T1 is the time width adjusted for each LH.

[0133] For example, LH1 to LH8 are evenly distributed, and between two adjacent LHs, the interval t between the start time of the previous LH and the start time of the next LH is about 1.8ms. The time width of each LH adjustment can be 1.8ms, and the time width of the frame blanking interval T1 can be increased by 1.8ms.

[0134] However, if the frame period T remains unchanged, increasing the duration of the frame blanking interval T1 will compress the duration of the effective working interval T2, and thus the duration of the display refresh phase T21 and the touch detection phase T22, thereby affecting the display refresh, touch detection, and active pen 3 detection performance of the touch screen 2. This problem is particularly pronounced when the touch screen 2 has a high refresh rate.

[0135] To solve the above problems, some embodiments of the present application also provide a method for controlling a touch display screen. FIG10 is a schematic diagram of a method for controlling a touch display screen according to some embodiments; FIG11 is a flow chart of a method for controlling a touch display screen according to some embodiments.

[0136] 10 , the plurality of long line blanking periods LH include the first long line blanking period LH1 to the mth long line blanking period LH(m), where m≥2. The positions of the long line blanking periods LH in different frame periods T are changed.

[0137] 11 , the control method of the touch screen display 2 includes the following steps S10 to S20:

[0138] S10: In the first long line blanking phase LH1, the touch screen 2 transmits an uplink signal, which is used to detect whether the active pen 3 operates on the touch screen 2. For example, it detects whether the active pen 3 operates on the touch screen 2 by touching or writing.

[0139] As mentioned above, when the display refresh frequency is 60 Hz and the touch detection frequency is 120 Hz, eight touch detection phases T22 need to be inserted into one frame of display refresh.

[0140] Referring to Figure 10, the touch display screen 2 transmits an uplink signal in the first long line blanking phase LH1 and does not perform touch detection. Therefore, the multiple long line blanking phases LH include the first long line blanking phase LH1 to the ninth long line blanking phase LH9, and the touch display screen 2 performs touch detection in the second long line blanking phase LH2 to the ninth long line blanking phase LH9.

[0141] Based on this, the control method of the touch display screen 2 further includes: reducing the duration of the frame blanking interval T1 to increase the duration of the effective working interval T2, so as to add the first long line blanking phase LH1 in the effective working interval T2.

[0142] For example, according to the protocol between the active pen 3 and the touch display screen 2, the duration of the first long line blanking phase LH1 is the same as the time width a of the uplink signal. Therefore, the duration of the frame blanking interval T1 can be reduced by a to provide time width for the addition of the first long line blanking phase LH1.

[0143] S20 : ​​During the second long line blanking period LH2 to the m-th long line blanking period LH(m), the touch display screen 2 receives a downlink signal from the active pen 3 to detect the active pen 3 .

[0144] In the control method provided by the above embodiment of the present application, the touch screen 2 transmits an uplink signal in the first long line blanking phase LH1. In the subsequent long line blanking phase LH, the touch screen 2 receives a downlink signal from the active pen 3 to detect the active pen 3.

[0145] Compared with the related art, the touch screen display 2 is controlled to transmit the uplink signal in the frame blanking interval T1. The control method provided in the above embodiment of the present application moves the time when the touch screen display 2 transmits the uplink signal from the frame blanking interval T1 to the long line blanking stage LH. In this way, when the position of the long line blanking stage LH changes, the position of the downlink signal changes. According to the protocol between the active pen 3 and the touch screen display 2, the position of the uplink signal also needs to be changed. Since the touch screen display 2 does not transmit the uplink signal in the frame blanking interval T1, the change in the position of the uplink signal does not require increasing the time width of the frame blanking interval T1, avoiding compressing the time width of the effective working interval T2, and avoiding compressing the time width of the display refresh stage T21 and the touch detection stage T22, which is beneficial to improving the display refresh, touch detection and active pen 3 detection performance of the touch screen display 2.

[0146] 10 , in at least two frame periods T, the corresponding two long line blanking phases LH are respectively located between the line scanning periods of two adjacent rows of sub-pixels. That is, the corresponding two long line blanking phases LH are located at different positions in different frame periods T.

[0147] For example, in the i-th frame period and the j-th frame period (i≠j), the positions of the uplink1 signal and the uplink2 signal are different, and the positions of the downlink1 signal and the downlink2 signal are different, that is, the positions of LH1 to LH(m) all change. The i-th frame period and the j-th frame period can be two adjacent frame periods T or two non-adjacent frame periods T.

[0148] "Two corresponding long line blanking periods LH" refer to two long line blanking periods LH with the same sequence in two different frame periods. For example, LH1 in the i-th frame period corresponds to LH1 in the j-th frame period, LH2 in the i-th frame period corresponds to LH2 in the j-th frame period, and so on. LH(m) in the i-th frame period corresponds to LH(m) in the j-th frame period.

[0149] It can be understood that in at least two frame periods T, the corresponding two long line blanking stages LH are respectively located between the line scanning periods of two different adjacent rows of sub-pixels. By changing the position of the long line blanking stage LH in different frame periods T, the time for the gate scanning signal to stay in different shift registers is roughly the same. In this way, the speed at which different shift registers age and the driving force decreases is roughly the same, which can improve the phenomenon of "bright lines" or "dark lines" displayed by sub-pixels in each row, thereby improving the quality of the displayed image.

[0150] In some embodiments, in two adjacent frame periods T, two corresponding long line blanking phases LH are respectively located between line scanning periods of two different adjacent rows of sub-pixels.

[0151] It can be understood that by changing the position of the long line blanking stage LH in two adjacent frame periods T, the time that the gate scanning signal stays in the same shift register can be further shortened, which is beneficial to reducing the speed at which the shift register ages and the driving force decreases, improving the phenomenon of the sub-pixels in this row displaying "bright lines" or "dark lines", and improving the quality of the displayed image.

[0152] In some embodiments, referring to FIG. 10 , in different frame periods T, the duration of intervals between multiple long line blanking phases LH remains unchanged.

[0153] As previously mentioned, the protocol between active pen 3 and touchscreen display 2 stipulates that the intervals between an uplink signal and the first downlink signal, as well as between two adjacent downlink signals, have a fixed value (b). This protocol ensures accurate detection of active pen 3 by synchronously shifting the positions of multiple long line blanking phases (LH) over different frame periods (T) to maintain a constant interval length (constant b).

[0154] In some embodiments, referring to FIG. 10 , in each frame period T, the multiple long line blanking stages LH include at least three long line blanking stages LH, and the interval between any two adjacent long line blanking stages LH is equal in duration, so that the multiple long line blanking stages LH are evenly distributed between the row scanning periods of multiple rows of sub-pixels.

[0155] On this basis, by changing the position of the long line blanking stage LH in different frame periods T, the gate scanning signal stays in the shift registers at each level for roughly the same time. In this way, the speed at which the shift registers at each level age and the driving force decrease is roughly the same, which can improve the phenomenon of "bright lines" or "dark lines" displayed by sub-pixels in each row and improve the quality of the displayed image.

[0156] Exemplarily, the intervals between any two adjacent long line blanking phases LH are equal in duration, and the duration of the intervals is b, so as to meet the agreement between the active pen 3 and the touch display screen 2 .

[0157] In some embodiments, referring to FIG. 10 , according to a protocol between the active pen 3 and the touch display screen 2 , the time width of the uplink signal is a, and the time width of the downlink signal is c.

[0158] The touchscreen display 2 transmits an uplink signal during the first long line blanking period LH1 and detects the active pen 3 based on the downlink signal during the second long line blanking period LH2 through the m-th long line blanking period LH(m). Therefore, the first long line blanking period LH1 lasts a, and the second long line blanking period LH2 through the m-th long line blanking period LH(m) last the same length, namely c.

[0159] When a≠c, the duration of the first long line blanking period LH1 is not equal to the duration of any long line blanking period LH from the second long line blanking period LH2 to the mth long line blanking period LH(m).

[0160] In the case of a=c, the durations of the first long line blanking period LH1 to the mth long line blanking period LH(m) are all equal.

[0161] 12 to 14 are various flow charts of methods for controlling a touch display screen according to some embodiments.

[0162] 12 , the control method of the touch display screen 2 includes the following S21:

[0163] S21: In the second long line blanking period LH2 to the m-th long line blanking period LH(m), touch detection is performed based on the touch display screen 2 not receiving the downlink signal.

[0164] It can be understood that, in the second long line blanking stage LH2 to the mth long line blanking stage LH(m), when the touch screen 2 does not receive the downlink signal, it indicates that the active pen 3 is not close to the touch screen 2 and the active pen 3 does not operate the touch screen 2. Based on this, multiple touch electrodes 26 can be used for touch detection.

[0165] In some embodiments, referring to FIG. 13 , the control method of the touch display screen 2 includes the following step S30:

[0166] S30: Perform touch detection in the frame blanking interval T1.

[0167] It is understandable that, during the frame blanking interval T1 , the touch screen display 2 does not perform display refresh, and the touch electrodes 26 can be used to perform touch detection to detect a user's touch operation on the touch screen display 2 .

[0168] In some embodiments, referring to FIG. 14 , the control method of the touch display screen 2 includes the following S40:

[0169] S40: In the display refresh phase T21, display driving is performed.

[0170] It is understandable that in the display refresh phase T21 , the multiple touch electrodes 26 are reused as a common electrode, and the pixel electrodes 232 and the touch electrodes 26 form an electric field to drive the liquid crystal molecules in the liquid crystal layer 25 to rotate, thereby realizing display driving of the touch screen 2 .

[0171] Some embodiments of the present application further provide a touch display screen. FIG15 is a structural diagram of a touch display screen according to some embodiments.

[0172] 15 , the touch display screen 2 is configured to transmit uplinks during the first long line blanking phase, and to receive downlinks from the active pen during the second to m-th long line blanking phases.

[0173] In the touch screen provided by the above embodiment of the present application, the touch screen 2 transmits an uplink signal during the first long line blanking phase LH1 , and receives a downlink signal from the active pen 3 during the subsequent long line blanking phase LH to detect the active pen 3 .

[0174] The position of the long line blanking phase changes in different frame periods. In this case, the time when the touch screen display 2 transmits the uplink signal is moved from the frame blanking interval T1 to the long line blanking phase LH. In this way, when the position of the long line blanking phase LH changes, the position of the downlink signal changes. According to the protocol between the active pen 3 and the touch screen 2, the position of the uplink signal also needs to be changed. Since the touch screen 2 does not transmit the uplink signal in the frame blanking interval T1, the change in the position of the uplink signal does not require increasing the time width of the frame blanking interval T1, avoiding compressing the time width of the effective working interval T2, and avoiding compressing the time width of the display refresh phase T21 and the touch detection phase T22, which is beneficial to improving the display refresh, touch detection and active pen 3 detection performance of the touch screen 2.

[0175] In some embodiments, referring to FIG. 15 , the touch screen 2 includes a timing controller 31 , a touch driving circuit 29 , and a plurality of touch electrodes 26 disposed inside the touch screen 2 .

[0176] Exemplarily, the touch display screen 2 further includes a printed circuit board (PCB) 32 , and the timing controller 31 may be disposed on the PCB 32 .

[0177] Continuing with FIG15 , the timing controller 31 is electrically connected to the plurality of touch electrodes 26 via the touch driver circuit 29. The timing controller 31 is configured to send a first control signal to the touch driver circuit 29 during the first long line blanking period LH1. The touch driver circuit 29 is configured to drive the plurality of touch electrodes 26 to transmit uplink signals in response to the first control signal.

[0178] The timing controller 31 is further configured to send a second control signal to the touch driver circuit 29 during the second long line blanking period LH2 to the m-th long line blanking period LH(m). The touch driver circuit 29 is further configured to detect the active pen 3 in response to the second control signal based on the downlink signal received from the active pen by the multiple touch electrodes 26, thereby achieving flexible control between the active pen 3 and the touch display screen 2.

[0179] Exemplarily, the timing controller 31 and the touch driving circuit 29 may be connected via a flexible printed circuit (FPC) 30 .

[0180] In the above embodiment, the touch driving circuit 29 is controlled by the timing controller 31 . In the first long line blanking period LH1 , the touch driving circuit 29 transmits a driving signal to the touch electrodes 26 to drive the touch electrodes 26 to transmit uplink signals.

[0181] Furthermore, during the second long line blanking period LH2 to the mth long line blanking period LH(m), when the active stylus 3 approaches the touch electrode 26, the touch electrode 26 senses the active stylus 3 and receives the downlink signal from the active stylus 3. The touch driving circuit 29 is controlled by the timing controller 31, and the touch driving circuit 29 detects the active stylus 3 based on the downlink signal from the touch electrode 26.

[0182] In some embodiments, referring to FIG. 15 , the timing controller 31 is further configured to send a third control signal to the touch driving circuit 29 during the second long line blanking period LH2 to the m-th long line blanking period LH(m). The touch driving circuit 29 is further configured to drive the touch electrodes 26 to perform touch detection in response to the third control signal based on the fact that the touch electrodes 26 do not receive a downlink signal from the active pen 3 .

[0183] It can be understood that in the second long line blanking stage LH2 to the mth long line blanking stage LH(m), when multiple touch electrodes 26 do not receive the downlink signal, it indicates that the active pen 3 is not close to the touch display screen 2 and the active pen 3 does not operate the touch display screen 2.

[0184] Based on this, when a user touches the touch display screen 2, the touch electrodes 26 generate sensing signals, and the touch driving circuit 29 is controlled by the timing controller 31, so that the touch driving circuit 29 can perform touch detection according to the sensing signals.

[0185] 15 , in some embodiments, the timing controller 31 is further configured to send a fourth control signal to the touch driving circuit 29 during the frame blanking interval T1. The touch driving circuit 29 is further configured to drive the plurality of touch electrodes 26 for touch detection in response to the fourth control signal.

[0186] It is understood that during the frame blanking interval T1, the touch screen display 2 does not refresh the display. Therefore, when a user touches the touch screen display 2, the touch electrodes 26 generate sensing signals. The timing controller 31 controls the touch driver circuit 29, which then performs touch detection based on the sensing signals.

[0187] 15 , in some embodiments, the timing controller 31 is further configured to send a fifth control signal to the touch driving circuit 29 during the display refresh phase T21. The touch driving circuit 29 is further configured to drive the touch electrodes 26 to perform display driving in response to the fifth control signal.

[0188] It is understood that during the display refresh phase T21, the multiple touch electrodes 26 are multiplexed as a common electrode, and the touch driving circuit 29 is controlled by the timing controller 31 to transmit a common voltage signal to the multiple touch electrodes 26. Furthermore, the pixel electrodes 232 receive the pixel voltage signal from the pixel driving circuit 231. The pixel electrodes 232 and the touch electrodes 26 form an electric field to drive the liquid crystal molecules in the liquid crystal layer 25 to rotate, thereby realizing display driving of the touch display screen 2.

[0189] In some embodiments of the present application, the touch display device 1 provided by the present invention comprises a touch screen 2 configured to transmit an uplink signal during a first long line blanking period (LH1). The active stylus 3 is configured to transmit at least one downlink signal in response to the uplink signal. The touch screen 2 is further configured to receive at least one downlink signal during at least one long line blanking period (LH) between a second long line blanking period (LH2) and an m-th long line blanking period (LH(m)) to detect the active stylus 3.

[0190] In the touch display device 1 provided in the above-described embodiment of the present application, the touch screen 2 can transmit an uplink signal during the first long line blanking phase LH1. According to the protocol between the active stylus 3 and the touch screen 2, the active stylus 3 can respond to the uplink signal by transmitting at least one downlink signal during at least one long line blanking phase LH, from the second long line blanking phase LH2 to the mth long line blanking phase LH(m). The touch screen 2 can receive the downlink signal during the corresponding long line blanking phase LH to detect the active stylus 3.

[0191] The position of the long line blanking stage LH changes in different frame periods T. In this case, the touch display screen 2 transmits the uplink signal in the first long line blanking stage LH1, and does not transmit the uplink signal in the frame blanking interval T1. The change in the position of the uplink signal does not require increasing the time width of the frame blanking interval T1, thereby avoiding compressing the time width of the effective working interval T2, and avoiding compressing the time width of the display refresh stage T21 and the touch detection stage T22, which is beneficial to improving the display refresh, touch detection and active pen 3 detection performance of the touch display screen 2.

[0192] Some embodiments of the present application further provide a method for controlling a touch display device. FIG16 is a flowchart of the method for controlling a touch display device according to some embodiments.

[0193] 16 , the control method of the touch display device 1 includes the following steps S50 to S60:

[0194] S50: In the first long line blanking phase LH1, the touch screen 2 transmits an uplink signal, and the active pen 3 receives the uplink signal.

[0195] Illustratively, in the first long line blanking phase LH1 , the active pen 3 is brought close to the touch display screen 2 to receive the uplink signal transmitted by the touch display screen 2 .

[0196] S60: In at least one long line blanking phase LH from the second long line blanking phase LH2 to the mth long line blanking phase LH(m), the active pen 3 transmits a downlink signal in response to the uplink signal. The touch screen 2 receives the downlink signal to detect the active pen 3.

[0197] In the control method provided by the above-described embodiments of the present application, during the first long line blanking period (LH1), the touch screen 2 transmits an uplink signal, and the active stylus 3 receives the uplink signal. According to the protocol between the active stylus 3 and the touch screen 2, during at least one subsequent long line blanking period (LH), the active stylus 3 transmits a downlink signal in response to the uplink signal, and the touch screen 2 receives the downlink signal, thereby detecting the active stylus 3.

[0198] The position of the long line blanking phase LH changes in different frame periods T. In this case, the touch display screen 2 transmits an uplink signal in the first long line blanking phase LH1, and does not transmit an uplink signal in the frame blanking interval T1. The change in the position of the uplink signal does not require increasing the time width of the frame blanking interval T1, thereby avoiding compressing the time width of the effective working interval T2, and avoiding compressing the time widths of the display refresh phase T21 and the touch detection phase T22, which is beneficial to improving the display refresh, touch detection and active pen 3 detection performance of the touch display screen 2.

[0199] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present disclosure should be included within the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A method for controlling a touch display screen, characterized in that: The display of the touch screen includes multiple frame periods, each of the frame periods includes a frame blanking interval and an effective working interval, the effective working interval includes multiple display refresh phases and multiple long line blanking phases that are alternately arranged, and the multiple long line blanking phases include the first to mth long line blanking phases, where m≥2; The control method includes: During the first long line blanking phase, transmitting an uplink signal; During the 2nd to mth long line blanking phases, the downward signal from the active pen is received.

2. The control method according to claim 1, characterized in that: The multiple display refresh phases include row scanning periods of multiple rows of sub-pixels of the touch display screen; In at least two of the frame periods, the corresponding two long row blanking phases are respectively located between row scanning periods of two different adjacent rows of sub-pixels.

3. The control method according to claim 2, characterized in that: In two adjacent frame periods, the corresponding two long row blanking phases are respectively located between row scanning periods of two different adjacent rows of sub-pixels.

4. The control method according to any one of claims 1 to 3, characterized in that: In different frame periods, the durations of intervals between the multiple long line blanking phases remain unchanged.

5. The control method according to any one of claims 1 to 4, characterized in that: In the frame period, the plurality of long line blanking phases include at least three long line blanking phases, and the duration of the interval between any two adjacent long line blanking phases is equal.

6. The control method according to any one of claims 1 to 5, characterized in that: The durations of the second to m-th long line blanking phases are equal; the duration of the first long line blanking phase is not equal to the duration of any of the second to m-th long line blanking phases; or The durations of the first to mth long line blanking phases are equal.

7. The control method according to any one of claims 1 to 6, characterized in that: The duration of the uplink signal is equal to the duration of the first long line blanking phase.

8. The control method according to any one of claims 1 to 7, characterized in that: The control method further includes: During the second to mth long line blanking phases, touch detection is performed based on the touch display screen not receiving the downlink signal.

9. The control method according to any one of claims 1 to 8, characterized in that: The control method further includes: During the frame blanking interval, touch detection is performed.

10. The control method according to any one of claims 1 to 9, characterized in that: The control method further includes: During the display refresh phase, display driving is performed.

11. A touch display screen, characterized in that: The display of the touch screen includes multiple frame periods, each of the frame periods includes a frame blanking interval and an effective working interval, the effective working interval includes multiple display refresh phases and multiple long line blanking phases that are alternately arranged, and the multiple long line blanking phases include the first to mth long line blanking phases, where m≥2; The touch display screen is configured to transmit an uplink signal during the first long line blanking phase; and receive a downlink signal from the active pen during the second to mth long line blanking phases.

12. The touch display screen according to claim 11, wherein: The touch display screen includes a timing controller, a touch driving circuit, and a plurality of touch electrodes arranged inside the touch display screen, wherein the timing controller is electrically connected to the plurality of touch electrodes through the touch driving circuit; The timing controller is configured to send a first control signal to the touch driving circuit during the first long line blanking phase; the touch driving circuit is configured to drive the plurality of touch electrodes to transmit uplink signals in response to the first control signal; The timing controller is further configured to send a second control signal to the touch drive circuit during the 2nd to mth long line blanking phases; the touch drive circuit is further configured to perform active pen detection based on the multiple touch electrodes receiving the downlink signal from the active pen in response to the second control signal.

13. The touch display screen according to claim 12, wherein: The timing controller is further configured to send a third control signal to the touch driving circuit during the second to m-th long line blanking phases; The touch driving circuit is further configured to, in response to the third control signal, drive the plurality of touch electrodes to perform touch detection based on the fact that the plurality of touch electrodes do not receive a downlink signal from the active pen.

14. The touch display screen according to claim 12 or 13, wherein: The timing controller is further configured to send a fourth control signal to the touch driving circuit during the frame blanking interval; The touch driving circuit is further configured to drive the plurality of touch electrodes to perform touch detection in response to the fourth control signal.

15. The touch display screen according to any one of claims 12 to 14, characterized in that: The timing controller is further configured to send a fifth control signal to the touch driving circuit during the display refresh phase; The touch driving circuit is further configured to drive the plurality of touch electrodes to perform display driving in response to the fifth control signal.

16. A touch display device, characterized in that: include: An active pen and a touch display screen as claimed in any one of claims 11 to 15; The touch screen display is configured to transmit an uplink signal during the first long line blanking phase; The active pen is configured to transmit at least one downlink signal in response to the uplink signal; The touch display screen is further configured to receive the at least one downlink signal in at least one long line blanking period among the 2nd to mth long line blanking periods.

17. A method for controlling a touch display device, characterized in that: The touch display device comprises an active pen and a touch display screen as claimed in any one of claims 11 to 15; The control method includes: During the first long line blanking phase, the touch display screen transmits an uplink signal, and the active pen receives the uplink signal; In at least one long line blanking phase among the 2nd to mth long line blanking phases, the active pen transmits a downlink signal in response to the uplink signal; and the touch display screen receives the downlink signal.

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